Finding the Third Proportional to 931.50 and 1,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   931.50 : 1,921.50 = 1,921.50 : x
2. Step 2: Convert to fraction form
   931.50/1,921.50 = 1,921.50/x
3. Step 3: Cross multiply
   931.50x = 1,921.50 × 1,921.50
4. Step 4: Simplify right side
   931.50x = 3,692,162.25
5. Step 5: Solve for x
   x = 3,692,162.25/931.50
6. Step 6: Final answer
   x = 3,963.67